| Physa |
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| Five shells of Physa fontinalis |
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| Scientific classification |
| Domain: |
Eukaryota |
| Kingdom: |
Animalia |
| Phylum: |
Mollusca |
| Class: |
Gastropoda |
| Superorder: |
Hygrophila |
| Superfamily: |
Lymnaeoidea |
| Family: |
Physidae |
| Genus: |
Physa
Draparnaud, 1801 |
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|
| Type species |
Bulla fontinalis
Linnaeus, 1758 |
| Synonyms |
- Laurentiphysa Taylor, 2003 (a junior synonym)
- Limnea (Physa) Draparnaud, 1801
- Physa (Diastropha) Gray, 1840
- Physa (Gyrina) Schumacher, 1817
- Physa (Laurentiphysa) Taylor, 2003 (a junior synonym)
- Physa (Mediterraneophysa) Starobogatov & Budnikova, 1976 (a junior synonym)
- Physa (Physa) Draparnaud, 1801
- Physa (Ussuriphysa) Starobogatov & Prozorova, 1989
- Rivicola Fitzinger, 1833 (Invalid: junior objective synonym of Physa, with the same type species)
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Physa is a genus of small, left-handed or sinistral, air-breathing freshwater snails, aquatic pulmonate gastropod molluscs in the subfamily Physinae of the family Physidae.
These snails eat algae, diatoms and detritus.